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Abstract

The complementary current switch utilizes NPN and both isolated and non-isolated PNP transistors to provide both OR and AND functions and dual-phase emitter follower outputs.

Country

United States

Language

English (United States)

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Complementary Current Switch

The complementary current switch utilizes NPN and both isolated and non-
isolated PNP transistors to provide both OR and AND functions and dual-phase
emitter follower outputs.

The functions available are OR, AND, NOR, and NAND. Dotting of circuits is
not necessary since inputs may be extended to provide as many inputs in one
circuit as desired.

Transistors T1 and T4 together with collector load resistor R3 and emitter
current source resistor R4 form an NPN current switch.

Transistors T2 and T3 together with collector load resistor R2 and emitter
current source resistor R1 form a PNP current switch.

The collector of input NPN transistor T1 is connected to the emitters of PNP
transistors 12 and T3. The collector of input PNP transistor 12 is connected to
the emitters of NPN transistors T1 and T4. Thus, a dual complementary current
switch is formed.

Both the NPN and PHP current switches may be turned on and off by either
the HPN or PNP input transistor.

The drawing shows only one input NPN and one input PHP; however, both
inputs may be extended to the desired number. Multiple NPH inputs provide the
AND, NAND functions, and multiple PNP inputs provide the OR, NOR functions.